"Did you know that Tanystropheus had a neck longer than its whole body? Or that Odobenocetops had tusks like a walrus? Millions of years before dinosaurs roamed the land, all of Earth's creatures lived in the water. Every creature on land today--even humans--originally evolved from prehistoric fish! From spiral-shelled Ammonites to Shastasurus, the largest predatory shark of all time, you'll discover tons of fun facts plus amazing illustrations. Learn all about the fish, invertebrates, dinosaurs, amphibians, and reptiles that ruled the ancient seas"-- Back cover